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Simplifying cos(2x) = 3cosx Remove parenthesis around (2x) cos * 2x = 3cosx Reorder the terms for easier multiplication: 2cos * x = 3cosx Multiply cos * x 2cosx = 3cosx Solving 2cosx = 3cosx Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-3cosx' to each side of the equation. 2cosx + -3cosx = 3cosx + -3cosx Combine like terms: 2cosx + -3cosx = -1cosx -1cosx = 3cosx + -3cosx Combine like terms: 3cosx + -3cosx = 0 -1cosx = 0 Divide each side by '-1'. cosx = 0 Simplifying cosx = 0 The solution to this equation could not be determined.
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